Question

PAST INDEFINTE ИЛИ PRESENT PERFECT

(TO HAVe DINNER )

.......(YOU) YET?

YES ,WE .... AT THREE O CLOCK

Answer 1

Have you had dinner yet? Yes, we've had dinner at 3 o'clock (yes, we have)

Answer 2

Have you had dinner yet&
     - Yes, we have had at three o'clock.